Same here... I've never had to reboot my modem and pc as much as this before. it's been happening for about 2 to 3 weeks, the modem (NTL:250) just seems to intermittently freeze while browsing or I get disconnected.
I dont know if this is the right info people need to see.. But it looks techy enough 
I'm in manchester on the 10mb
Cable Modem : Euro-DOCSIS 1.0/1.1/2.0 Compliant
Boot Code Version : 2.1.6d
Software Version : 2.94.1010
Hardware Version : 1.19
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Disabled